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/src/FreeImage/Source/LibOpenJPEG/raw.c

https://bitbucket.org/cabalistic/ogredeps/
C | 87 lines | 38 code | 11 blank | 38 comment | 8 complexity | b5ceacfc944788a96621791fd258725f MD5 | raw file
 1/*
 2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
 3 * Copyright (c) 2002-2007, Professor Benoit Macq
 4 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
 5 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 6 * All rights reserved.
 7 *
 8 * Redistribution and use in source and binary forms, with or without
 9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "opj_includes.h"
31
32/* 
33==========================================================
34   local functions
35==========================================================
36*/
37
38
39/* 
40==========================================================
41   RAW encoding interface
42==========================================================
43*/
44
45opj_raw_t* raw_create(void) {
46	opj_raw_t *raw = (opj_raw_t*)opj_malloc(sizeof(opj_raw_t));
47	return raw;
48}
49
50void raw_destroy(opj_raw_t *raw) {
51	if(raw) {
52		opj_free(raw);
53	}
54}
55
56int raw_numbytes(opj_raw_t *raw) {
57	return raw->bp - raw->start;
58}
59
60void raw_init_dec(opj_raw_t *raw, unsigned char *bp, int len) {
61	raw->start = bp;
62	raw->lenmax = len;
63	raw->len = 0;
64	raw->c = 0;
65	raw->ct = 0;
66}
67
68int raw_decode(opj_raw_t *raw) {
69	int d;
70	if (raw->ct == 0) {
71		raw->ct = 8;
72		if (raw->len == raw->lenmax) {
73			raw->c = 0xff;
74		} else {
75			if (raw->c == 0xff) {
76				raw->ct = 7;
77			}
78			raw->c = *(raw->start + raw->len);
79			raw->len++;
80		}
81	}
82	raw->ct--;
83	d = (raw->c >> raw->ct) & 0x01;
84	
85	return d;
86}
87